Cal's Keenan Allen, projected by many NFL Draft analysts as a first-round pick in April's NFL Draft, will not work out at this week's Combine in Indianapolis, his agent J.T. Johnson confirmed to CBSSports.com Wednesday morning.

Feldman added:

Allen had some swelling in his knee while he was training. He went to get an MRI and saw noted orthopedic surgeon Dr. James Andrews, who diagnosed Allen as having a Grade 2 PCL strain. According to Allen's agent, Andrews told the 20-year-old wideout that his injury should not ever require surgical intervention.

Allen is scheduled to have a follow-up exam with Andrews on March 11. Allen will continue to do rehab to strengthen his quad muscles while the knee heals and he will only run routes at Cal's Pro Day on March 14, Johnson said.

Allen's talent and production isn't in question, but his top-end speed and ability to stay healthy at the next level are. He's likely competing with Tennessee's Cordarrelle Patterson to be the top wide receiver taken off the board, and missing the combine will make his pro day in April vital.

If Patterson kills it at the combine, Allen may find himself slip down draft boards, though he likely wasn't going to blow teams away with his 40-yard-dash time anyway. Allen will make his money by impressing teams with his game film.

In that regard, perhaps missing the combine isn't the worst thing in the world after all.

Last year, Allen caught 61 receptions for 737 yards and seven total touchdowns despite missing three games. He made his mark during his sophomore year, catching 98 passes for 1,343 yards and seven total scores.

I wouldn't expect Allen to slip out of the first round, but it's looking more and more likely that he'll end up being the second player off the board. Until we actually see him workout, it will be hard to project exactly where Allen might end up landing in the draft.